Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 12, Issue 12, Pages 1957-1965Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ob42338g
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- Gobierno de Espana [CTQ2011-28831]
- Spanish government
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Chromonic phases are a family of lyotropic liquid crystals (LC) formed by ionic aromatic mesogens such as disodium cromoglycate (cromolyn), sunset yellow and others. It is well known that chromonic phases are oriented in the presence of external magnetic fields, leading to the observation of anisotropic NMR observables such as quadrupolar splittings or residual dipolar couplings. Despite the fact that the cromolyn nematic LC phase (N) presents important advantages like great homogeneity, small line broadening, and easy sample preparation, it has been scarcely used as a water-compatible NMR orienting medium, in part due to a too strong induced degree of alignment on the guest molecules. However, the use of cromolyn-brine mixtures led to the optimum degree of alignment allowing to record H-1-C-13 dipolar couplings with good accuracy.
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